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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f72c0eb21ec9be7189c087e7dbaaf8b9848dbdbdfa4f909e7e80b73e956e5ee' 
  AND token = '70vKnXWgm/5sjI3jXYYVlwYvf5yGrYjM2RnZoCS/rLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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