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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b8e24d0a064f35956a08f92e67645535d24a98ca2738bc6c141014608f840e7' 
  AND token = 'dGvBsgj4+O2uQ6Ggb9RoB0OeZ+f0oDaXjlidCFhaZmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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