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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7213708d8bb6c155e11f8782213fca6780aee061e537fd4cd9ef3132e3241123' 
  AND token = '2GUiTeWf8sWs54XgKa8qJULJfOodd+B0R13Ng0V64dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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