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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1199e0c524cba7a90421ee209a13d4528136de6aa85634cad6d442936c0bf40' 
  AND token = '8Li4LAZcFTQ6hDp9h9ZDwcjOSQB1ZGnpSy13I2WUQXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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