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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e977c19d660556e068fb900f860cf601aa90ae1bfc3efa5eaf73eadf5a6ce2' 
  AND token = '5YFTB/4iVDcV+fysUtTgkY3NNrOnyJ47n7qn9BF4FI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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