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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff6e825d41e476b503f2e34be75ab41d882e1d7a455c5fa0a7706a19b61f4761' 
  AND token = 'NAtklmEm+lgnZuihqRPb7y7Qf8oOnBpcB2fTk8wEnPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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