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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65b41c56796ca8c88e70b5dab33d71557549643ec613caee195baaeafdbdd768' 
  AND token = '9y84V+QtLiROoqV83ERKk6jE13EhJ04JnZqD7FSreJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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