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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd612f0dc56dc984f5c35e55a6666bf37b08f08fed59c7163b4e772bb67272f44' 
  AND token = 'z5C8vMQD2F/Zb8MquxQ2CMfNRSQFmoyaaXT2C9lc/9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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