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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9eeb8e6a6b15bef92ac0cbc5f5a58bbf9751cdce4698a7005da4d30e884d478' 
  AND token = 'zFxWtcvaBh3QfDXAUMoYBlq18gPHwRTvWGuIAtD8ydU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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