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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '092e364ca10067360ef86cb54db313a9cf823fd25ab9a77ea7760cfad622c299' 
  AND token = 'AJDy3fSKHt6An5Tf9EQzd9VZomD82m7AbSLc7YUFZ0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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