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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd73013f9bd75f71c5457d10eb8c5f5270ce1198bcfc4689390cf8ca4df6f765' 
  AND token = '9fYo9DlM0QbgFloF1WPPbhQANvYO9NQPBXa84b2WcaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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