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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52110d9f020d39b2ffacd470b3550957b0781851f6b07747fc56a2629b7282b1' 
  AND token = 'e4WYJ6rkysk4IJPqaZqhADBqffXKGJ9RstOvSMp0PEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}