SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc11030295660f5365cba1a2c10724a4b67d02c29fc8377d50af779c8366cbdc' 
  AND token = 'PhvysJWbDVAF6kMeju/UBf7BYzqgTm1TmJa1sb8X+jI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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