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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70e0ab4f4ab804ff11607881f7526fcea455b1a2f24354ae12f483b8d53b5775' 
  AND token = 'hxa/5mXKwqkUO1xMn55KtugqHAi26y5OY6KOfBxw2co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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