SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5467c97392dc8a239031c45cd47bb03e71d5d02d28e615165d1ad16a61ae1fd' 
  AND token = 'HpEt1sv9D0QjsBprVGh+EvxzGFGW1+GWXK/NwDDvfyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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