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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '154fc71fb6a22c9b782dc29aa0a99a2590c500cf0157c48743bc73841091285e' 
  AND token = '0jNsRgpMNh4p8f8zXBsM4eOt1GTgw7g6K70q5326V6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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