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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939cc17a0939cc25e04e2b866ced94ded97de71bf2560a7f199b33196e394a14' 
  AND token = 'xsO7Uzm7+w1ts1cj8kaxcC5PZEBHb8QioFhVaNUK6Yw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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