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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44e9aaf4280754071962ed2a036f2e1a2241c26c671725079286a3be9fc834d4' 
  AND token = 'n3PDqtQRVjwFhThNEXuUu+5Xr0ugfE8IoBix0KPnA2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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