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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2842d102b5c07db0aa3fe311fc7175623d45b85029ebb5e1c3ca0aeeee819c' 
  AND token = '2+RpZU1j1NIbJG3zIjeEKYjccO0doP9KT9BubWlyO9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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