SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c819e38beae5b0761dabf8f90d72ae7ea60a4eba7305570ed1a6ce194ed5be04' 
  AND token = '+qq382o83vdODPGoghyiVRUV1oocXjrCNjVQ1ZneQrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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