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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0db620c28702e15e400bff1812259c64a4dc24535d20121e5f235f150d7a1a29' 
  AND token = '3xPNEnMvEGV9PdS/w0t0PnVqsMSqjObrXlvFZ/VqKCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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