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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd932974b40e8680512dc98a68bba5c2f92cad08cf8eec622f24db936792bf19a' 
  AND token = '1Vmcb3y9Yy0roBR6WM7QWmpVAt/UEtuDJGjwTdSbeFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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