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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbaa7d36294e5cb9e0e3713ed0e1b7d959f506986ec584cc69579b4ff57062ff' 
  AND token = '2tskSaB8pWQ1xz9eXOTs6AaApd4zJEiAdD28dhxNy8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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