SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '252c4b29ce09205abe4400f58eb685163d94fc9ca7282943cd582db3866eb7ab' 
  AND token = 'zWuBMuGVPn+s+Adal/kyr32Yn7h1DWRd++xjfn5JgK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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