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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99f1b5d154ab731b5bee571fd3e20544602a80793c53fe10523b5d5d54d338e8' 
  AND token = 'Zk5QPwERL0dnhsHG4CnwkP8MuAL8kqGd04/ufKsbXX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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