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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fea9e067e348d502b6b7ac7d15bff3eb7e2981584ee4f5b95c851995125476' 
  AND token = 'g8k5c6ZZq+9ADBu7HYTXgtX20lKh2Vdc7stdZ4oya6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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