SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993a1cb45640414fb73555b671411b6185ce390c84c405f74a3ad695f6a5e721' 
  AND token = 'sqRuqojnqtuAzLnx4bRJ1pNvCOhINGk0uKRDGIMlgQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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