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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a83c0c8eac36530092d5a3285a2ba8e4b4302ce5c06a532536526a759c9d7bcd' 
  AND token = 'caulnjYeENVq89sG5XMoiAiYOZ4T7DLpJlzHG+Nwy2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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