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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad859c221b13184fc031f03c92f348e84a29b84ccbdc168bc4157962b305096' 
  AND token = 'bjtcIxKREM7cB3Fu385/qs0ejeLhHeTnvWUt/40GaVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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