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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '793b7df72d9fb26de64f94c7ce6f0d68acf21df1bf2633af9d8f51b1a487c2aa' 
  AND token = '7VLl1v0uLlaS/XgA7fO/5YGTcB+J2weXJb/kWkFLa+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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