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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3073ca86b272e93e3bf22058243bafe092384a3c4644764b6cefd4b648b4538' 
  AND token = 'AWjorrvfCjk2I8XScOXYQTOcVPSTC6G8bQxPiBmUM4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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