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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c386088e46b2a2cf9418cecd1339e327c638a353dec69c5c4800e530f2ef2fe0' 
  AND token = '8/gyP/pQbrkvj6n+o9syZuzmFkh7gs6OAHurHnYVqrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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