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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92eb57e6bf102e82132c02d098c0bde8260c8e3bc3638f1cac8674ccb719a026' 
  AND token = '7jfhyjTq7jJ7JihxdoA8+Xxw7ep2NpDPJWTwLt1hEIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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