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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8657767055d8d637dd48a4eedfc47642d29906994bfa9a92c4ddd9400a92e777' 
  AND token = 'bkrE4F+7VkHVv+B/IdI2oKsf5cYgZK7wp0H8wIb+PH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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