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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98a06f38030f2204da3ef8f04a5a0e78853f432f161f7cb2ac704fcc367a71f6' 
  AND token = 'ONvXKchNGES8ZUnGwAbBu4KvsmiJ3F4N/ZYAkfSE+Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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