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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23de7494d274362a557a85f87247540d3e696a6aa75721a01881bc0064a336f0' 
  AND token = 'RGSo4AXah0W1St3c/t8uqq5SGUiXKQgRAQ/YhE15tvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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