SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c034c32431f7a7158c10f5d97772bd462cc547126c330f2fc8346ef0fd9c077b' 
  AND token = 'nW186YvVhaZ2YrrsXstKjgQOfw+4+Im+ADGNHXDdOaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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