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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f323b4022aa1561de0bb81a7c839ea032d00c3d28b3be8e5995aeb8e8cb3479' 
  AND token = 'lWb7WpIGp+MapjstbC104PsoS9OdCNicBB5QD/1dJEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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