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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b89c248f213233abe6633fcb23dbe5ef10e51d8f10c9cd367605e0a81f04aa03' 
  AND token = 'OAa0gkqzBniTd5/rWFMI07LtvHkFqhC+Ala/5O9ktN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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