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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06c143e10896387a8babf3ae6b3235992edd71f930ea47b306b346876e16ba0f' 
  AND token = 'duUrwkDSWwaotTbKOrbsES7/KylTt4DlUeU4DFAcntw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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