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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e5b35ab274accb658d8eb19c7f937dca334790b5048be2d17e58b495e54d64d' 
  AND token = 'mtJVD1/cMV0t8h+cbCXykiOWMso30FCHAJh5Z5goAo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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