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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b8ed7fc60dc6e31c30d41a9a2b30b45764bf2fb11baa4e6d0d7364b40e548ca' 
  AND token = '6hhQZ5UwSApmuEr2766tSjcQssg6VQfrM+OVeF8J36w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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