SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0260a7382d33ac6efe1fa4c322d5389c19ebb05f8c44b2f955f998e9c6d15b95' 
  AND token = 'gEZWqzui+KO0auYot8In/xWYvW1FEu+Xl/NWCkA6qBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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