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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7e2c23559f9546812f1a72a89e99f93dafc074df1a6fc1f296feefac0f94b96' 
  AND token = 'qxO0tOra5Nl5hWU2IWMD/oHPrwPjKacLVKM6wtVuUvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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