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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e719ccfb7a3dc4cabfe6edb276ef331304ff917dbabceb8dae4f58c6326a4a2' 
  AND token = 'krChMwyw/WEHKOAwdnNZde86CVoYn7aN3kLasCi0kRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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