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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878f246bef313d3b60c62bffcc544038fff24bc80e9d8d49871497e6afc666ca' 
  AND token = 'cd+ZxKtdfmNem315s0DpBQD4IJHvSSpEyg89ua8CLIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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