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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1e3a55a7dafe8f183727bb7cafd2f1c1aeb5ae05021ee17f3dd75a55b0eda59' 
  AND token = '/nkVN1Swf/SCfG6EjdnFYh0WlT2tWZYDgd1rkoGscRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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