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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c82b4608ad41924382e8232e5198aab93da68758f0266ce853ce7514b02ab18a' 
  AND token = 'p60GNFQq6euZTyGZeyFhuVhnDiYkNLbuUDIr7vYaMyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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