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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb079098e40fecf3912a4feecfd247e44bf13e4e42f7db6d22fc2273b01b061e' 
  AND token = 'AIeXIXxzVJYQIxz/ViRD3xk1kKFWzUc8CBcKohrMnto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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