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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '861591d5271d1ed4c89b516a409a64a9a5c93f0cfcf4897e28502046e38e03d7' 
  AND token = 'J3UQxAIUKeBqfYOttXHu7jDJ+1FFC4ynpMta6UIYayw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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