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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edba8954f8e73799bc996da4bcb9b7a3b683ad0bf20e53f8b76cd54030a9dfee' 
  AND token = 'ILXioQObJ30ZeOaULLK1ZLfw+pHnMhXUJpGFg1kMckg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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