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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a09f636c7c72e4c93e2a8b418ef2dedb32857b689387db7f9bb29d323a48ebde' 
  AND token = '2eAsrfWGTUf/aRs0GCIX+555VjZR9dwyxFqI1FXa0EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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