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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830f8ff6dda8b8d0ab0f97d1c2f709f2ccb0a5cf3b8e0664e989ff04ec9ccf4b' 
  AND token = 'B11c6vf9tgG6286BgkaGa4ebEV8o3GPb9JJkTboiXJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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