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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b68b7b96247251d828ffbe61f9c0c46afc72103a5bd0fb82eaf9da37a1cefadf' 
  AND token = 'OS30yHfXtEZ25ZpCZOgTdAxrXbCaoLvBLvT8CWOvWLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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