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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6733a43d37c9030ffa4833f95563b3e1c6a50395fb4596d69bd281e684fc2f7' 
  AND token = 'mLTfMGEKRonN2IGbVef10PLF3dyTtYO1vjH4U6VPKfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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