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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc4f3fa77fad3bd5520cd197aeb3f8cfe7f786657ea65f1c3cce63262644a3bd' 
  AND token = 'Zws6U5ucHeWVXIPZQ7d4wAhRzKdVT+cS+61Jn7HoEBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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