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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9b03aee81cf8b8c9bd0b8d0311e3ccb4281e89e48843d8cf3996ffb7d366db' 
  AND token = 'B+qFTkCA4ut2H4wteedERSysB6X39Cyk7ITVaoDIXGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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