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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45309ae46c7d4ff8f7170367b7b5b50e3609471c1e777ad637d7ceb796fe2716' 
  AND token = '9XxK6ryuiO776Pgbhd5CINAUTkIvXv8UXZKNCE1Qjmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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