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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10abb9e60f733f6ce5a851b6e10dfd254448c1b3afd0c8a442c19707bafb6c65' 
  AND token = 'C/CYf2KwTI8BEYy1N7B+ljEVOxDl0h5v51yaKICKTTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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