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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf67f02c22afa1521ba5d8bc3f297a2358360b4ab5dda18b3b6ed14ef8ae1ef' 
  AND token = 'qyeFgxJuN868IAo7wsCjE7h6N5TysNeD4h5Se/+7/X0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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