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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e8b3c35604f6ccc734fbe67379b59da1ac456552e34cc1f4203b594233b1d1' 
  AND token = 'evLD5qp436so7/TiAYNtw5YEHtbXAjkG3APC2JTBiNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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