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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fabd61f080f61dee92bbb3e9613e849dfa0a01b5a34b8a722cb08eb408afa5a' 
  AND token = 'GpTfBuNT7XS1AJ0dokU2shEPKG+pWDhzlL+YUt5PA9M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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