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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f6d2d0163a325cf19e03ea84d19136cbc4934fb378a50fd59928e5c9b408c1' 
  AND token = 'GOmG470GGhSsCi7mypv7Oe0wR9mEf/aiwXBwIzn9DNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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