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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d5fb60f0a4fec710f49a9c883df9c7af2ffb194b064855f0cfa998288d5d9af' 
  AND token = '7SquVhunVsPUUvpR6Mjv52ZxA4Ff2xBqOqaXzNOqayY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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