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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50f0adb494f1e33179485af410b0ed0e6e3842315d0ebd5b4b79e6580987bd77' 
  AND token = 'StU+JZ4X5tVE7+tbvLSrlhGAq5X9B03WS+ZzbjQTytk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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