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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ecbd283ea1a3cfe8fb8809ca6bf8ec40ad2e879010b7e066b1b60de8f58ead2' 
  AND token = '7N+3lgstf3H2WEfFIIOiGmZXcd60gVz+hADq9BGVdiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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