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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74cb47f54d5707cc1ada6303037c680783b1a1fe0dd44ac9240f360cc555407f' 
  AND token = 'n2FuQcJ6FRqTR4SCgelVQa26QvVXwbdGEDWw1jquh8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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