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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f42ba9828d6f29838960d80b54f54b41eec4f567c310dd48452e58cf8c50935' 
  AND token = 'HcM+VYEjbHGcZVwDZZg4Fa6OGDa2L2RyH+0mwmPxDNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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