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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3551206f20fc4b473b8b7d7a1a601719e42ba3b7e0e7d960e44c9c9ab35998e' 
  AND token = 'MZ8RYxzIihu62Odqd1/cZZaFkNWByb0Sv82TBHIhN30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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