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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '216ccaa36296df72859c54be5e60bf6802a19cc5fe15ae778d4a5bb3f12ade86' 
  AND token = 'wmrXJHBHkxt2oIcBDTSQzE/yfd7g7khQSEMAALlR7io=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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