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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83d1f86616de3472bd106a688422b41a7faa427f3ff198c7d475991e2f2921b6' 
  AND token = 'x0n9gJHgLUwo9Bonp9bRPUt1nG7Kjk7qoe3CBcKHI3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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