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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17158aa65a4dc5b0282ab0bd558cf64de21850ab2402e68f68cfb9f86d33f503' 
  AND token = 'rukwYmgLqSk+qFfOkwGwdFw6VGeZDmJNw2yy5iWOJZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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