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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5954d7194ea4f93323869ed093d6435912de117a04453ea2dc1ef7f0605dd27e' 
  AND token = 'fRU+XzgJOSZNdd/M17dnj3hTK4BDqypfhj9GtT/jx6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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