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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659c5962b694bebf70deda8404fdb9540ac8682224d1643a03a982146c9ac7aa' 
  AND token = 'dzc78KyPiVcJ/KpW2Gaxszyku2rJ9fD/AZST3ndscuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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