SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5d34077e5ca2514c392dbf2541244a0a9535ecfa2058a282a12522b6340a95' 
  AND token = 'v+Zw09UOs7qKPm6yjQNzsYZO9UquGPw9bDX16hsxjYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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