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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c52b5d5a3f67b0847fa9917f949407b9a8823c29e77e2d02eaafbd3b8f2330f' 
  AND token = 'AGy69EKFr7N3WJpCNr/NRo6A/HWGBE65xyjPWRske/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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