SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8ef9ff308e593acb5b164632a438c077b59fbab5932bb4a6bd98cc5d29011c' 
  AND token = 'BvBwRr67PKQx67GQiHRIQIQszhtKtMcfkq6+GzTLN+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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