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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb271bfec026c98e4fd42a25fb26bfa71969d9373971f320f73d400e8e606b19' 
  AND token = 'XZSE7Ke+rUk1+vG3ZjT79X0Q/gQBbI8uVSTX7KBs+pg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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