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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846cbe7bdd6c3f2315c0e97abea7b97bb4d04f3abef23486eb9a722b0d64f21b' 
  AND token = 'Ztulb4Ur6PPDQRaOvZCGbTjPT84nisYw7LIJJU52fVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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