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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0532ec32d6424ed456fecc71a421a2dfbedafb3ab546db66b2566c9456ef2bec' 
  AND token = 'OMgZ+kj/0V5QnZolVPAY6/t9ZWA2qBeryu0rQD9xhGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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