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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c63eeaf1b6f5f1d9ce824719399901b35e3d43f3cda1b18bb801c694bb39934' 
  AND token = 'qqeWICTozrkwmqk4odLuHPndnDcrWeZhwjotb/IW8C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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