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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0adcbaaa6eaf3d4fda18821b317b375a104de564818b1fec876d267a29b19ec2' 
  AND token = 'ka4KfgD08iJrMXrz1mxVdOzfBKQMVCI33fvs1tRpD1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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