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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8fa67271de1f2d1d3c21be51a00a82676d37237d96abfcfb449f195d1fb762b' 
  AND token = '7vCNKUiGGHdWdftTN0kJSsqIvU5TPgz1b1Si9b5z9ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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