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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8555d7751600cea5a0623995e372d6ac1495b7b902116a94cdf8f7d5d86ec565' 
  AND token = 'N6sXapk0VRIO6n670IBh8NpouO8fikBhG7I3ofctERQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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