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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1eca48163b016a89f30f12b335a21ac498cb5b0ae6815774e1a8ff531b885e' 
  AND token = 'u1iPEvSgLTbXM6vJuW0Nng/a7ILtX6KBvNqoCkUBafs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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