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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fae15aacd2a8d54cfdb70535ca0a40ebce8e95e64caf60146cbdc30270e50d2' 
  AND token = 'bunq8c1RuOSkI3wEJ9bZnCn1q3+7GxLkb+zMfz6s+qI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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