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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c2e683c7180d0aebb6be3bdc11bef3067ffa241c510e8fc4907a3ba1f62e43a' 
  AND token = 'L5Y8Z6kf5pBZbx+ICPaem6MchXSnyNk18gwSn2dTnHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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