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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d4c045ebbce4ab430ad3d62ec1d32895bf6a9c1d4e3d1577dcb96f808610ee9' 
  AND token = '+NkixG9WbSiMiWUGvo6SjFic6r7JCCdh8DZ0QykacWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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