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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa19ae1dd9a1732b043ea5f1d9e8cc67e21851a7d79fce9c2d086174b4ab9a71' 
  AND token = 'vDl9hvSRrDf+30wvVkQJmJqv8v7UURIZVDvoxBjWxpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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