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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6e15c452f40b9f78a26f435b5ffec695b62469bc08852e4972091121e403179' 
  AND token = 'qqt0IOZHoShGCK5E9rHxq63NJJ73UgTtdWE+J92jT6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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