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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92a0a6afa22bdb3e3d7874bae2a877b83d7c57e593307a368abfc2f5d4b40257' 
  AND token = '5LxypoqzJzKkU7wipfaT2oAxWXU58bD1OgrahAw4T4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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