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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63d834e6b4cf6235a38f0d06f68345e684c21f0a06fbb984c948b29e2bfb2c5e' 
  AND token = 'eJUgdVqUOrZwW8fCA48xXWGkr4yrlOGvz8s/gCMNd5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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