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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3c59b120a41eb601ef3d2bfa326f6e8200cc34e933b96870f0a4ca5fbe52d9' 
  AND token = 'tyqAib4FeiByTPG9qZXoBBLQmNI2GyjVWQK/YFukyHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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