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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee605a8b292af7f99bfbecead394d36ef4a702feb63571196fa2893f2b9230d' 
  AND token = 'wk3DoHxsV2fz78DV5c4xp1B84d6RDs7/fRCTghRbg1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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