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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab855e14423b6d134d2f55b051a000c40d765be81bdeacbea785beb154f1638' 
  AND token = 'V5ZqnvTLOi6F1oXGiHiOX3XeTIqVTCY7uwCkvG8QhE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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