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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be58353d10e565d7d9577e00a5f9529185631dd60134820f2fe63272e24b3bef' 
  AND token = 'uaPvT/p+MD/xTAgE1/1yqbAP1sj70qRKtah0HBPIAXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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