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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00933fd81d63fee99f717532714d73fae9c41842447f82e96a2030204b14f11f' 
  AND token = 'zc7f7WMvafwN4W1+mRMdKS1RhN04S9If3ThFKLxRRHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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